R-Pro › Field cases › Chillers
Absorption Chiller LiBr Crystallization Accident — Pipe and Heat Exchanger Blockage
Likely causes
LiBr solution concentration exceeds 65% — crystallization at ~50°C blocks pipes
Check: Immediately measure LiBr concentration by sampling — concentration ≥65% is crystallization risk. Check solution circulation pump current spike or shutdown (overcurrent when impeller jams from crystallization)
What to do: Stop machine immediately upon confirming crystallization — absolutely no forced circulation (pump impeller damage risk). Apply external steam or hot water (60~80°C) to crystallized pipe sections → verify gradual dissolution. Manually open dilution water valve, dilute until LiBr concentration below 55%, then restart
Machine stops without completing dilution cycle
Check: Check power failure or emergency stop history — verify if dilution cycle ran for 15+ minutes before shutdown. Check sequence log to see if cooling water pump shut off before the machine
What to do: Prevention: configure stop sequence to force 15+ minute dilution cycle completion before shutdown. Secure dilution cycle power via UPS or emergency generator for power failure. Fix cooling water pump shutdown sequence to occur after chiller main unit
After crystallization recovery, sample entire solution — confirm concentration 58~62%, pH 9.5~10.5, lithium chromate inhibitor 0.3%.
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
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